Update .env.example

Author: juli-dot-md

.env.example

@@ -21,7 +21,7 @@ AZURE_OPENAI_DEPLOYMENT=
 AZURE_OPENAI_EMBEDDING_DEPLOYMENT=
 AZURE_OPENAI_CHAT_DEPLOYMENT=
 
-# container variables
+# change if you are using external services
 KEYCLOAK_HOST=keycloak
 CELERY_BROKER_HOST=rabbit-mq
 PG_HOST=eval-db